Arrey, Doppler shift toh formula se niklegi, but sign convention ka chakkar hai – approach kare toh frequency badhe, recede kare toh ghategi. Par main kehta hoon, real awaaz voh 20 m/s ki speed se nahi, balki platform pe bhare logon ki awaaz se badalti hai. Jab woh chaiwala baba apna radio leke aata hai, uski whistle ki frequency mere liye har roz badhti hai, kyuki main jaanta hoon woh chai lekar aa raha hai.
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